Robert grisson



(No Model.) R. ISSON.

CRANK MECHANISM.

No. 601,563. Patented Mar. 29,1898.

UNITED STATES I PATENT O FICE.

ROBERT GRISSON, OF HAMBURG, GERMANY.

CRANK MECHANISM.

SPECIFICATION forming part of Letters Patent No. 601,563, dated March 29, 1898. Application filed February 12, 1898. Serial No. 670,110. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT GRISSON, a subject of the German Emperor, and a resident of Hamburg, in the Empire of Germany, have invented certain new and useful Improvements in Crank Mechanism, of which the following is a specification.

This invention relates to a crank mechanism with a driving-shaft supported eccentrically to the crank-bearing and connected with the crank by a sliding lever.

In order that my invention may be better understood by those skilled in the art to which it appertains, I will proceed to describe the same in detail andfor that purpose will refer to the accompanying drawings, wherein Figure 1 is an elevation of the improved crank mechanism. Fig. 2 is a like view showing the crank mechanism in another working position, and Fig. 3 is a transverse section on the line I II of Fig. 2.

Similar letters refer to similar parts throughout the several views. A crank a is supported so as to be capable of turning about a bearing 1) by means of a ring a, and the shaft 0 to be turned passes eccentrically through the crank-bearing b. The shaft 0 carries an arm or link d, which is connected with the crank a through the medium of a sliding block (1', adapted to move in a slot a in-the crank a, so that the latter and the link (i are practically in one plane."

The thus-combined crank a d d forms, therefore, in spite of its being composed of several separate parts, a straight crank-arm without laterally-projecting parts.

By this crank mechanism a force acting at the free end of the crank is designed to be utilized as advantageously as practicable. When the mechanism is, for instance, employed for a hand-winch whose drum is arranged upon the shaft 0, the workman in the usual position of the drum relatively to him can physiologically exert the greatest power during the movement of the crank through its upper path and the smallest power during the movement of the crank through its lower path. By the crank mechanism it is intended that this power shall be fully utilized, which is in fact the case, for during the passage of the crank through its upper path in contradistinction to the passage of the crank through its lower path there is the link d, moving at a smaller angular velocity. Accordingly the workman with a slower movement of the link d has here to exert his full power, and he may exert less power during the passage of the crank through the lower path with a quicker movement of the lever (1. These working conditions insure a uniform axle.

The arrangement hereinbefore set forth may also be on two sides with two cranks, which assist each other over their dead-points.

The slot a in the crank a may be closed or shut up when required by suitable covers or plates e of any convenient material-as, for instance, celluloid-as indicated in Fig. 3, so that the link d and its sliding block (1 work in a wholly-closed box. This box, moreover, may be used for lubricating purposes by filling it up with a suitable lubricant or oil. In order that the lubricant may pass from the outer side'of the sliding block to the inner for lubricating the bearing and shaft,suitable grooves or perforations 01 may be provided in the said sliding block.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. The combination with a shaft and a fixed eccentric through which said shaft passes freely, of a crank provided with a bearing for and of greater depth than said eccentric, a link fixedon the shaft within said crank-bearing so as not to project therefrom, a sliding connection between said link and crank and confined within the outer surfaces of the latter, and means for applying power to the crank, for the purpose set forth.

2. The combination with a shaft,and a fixed eccentric through which said shaft passes freely, of a crank provided with a circular bearing for the eccentric, and with a longitudinal slot merging into said bearing, a link a slide-block connected with the link and working in the slot of the crank, and means for closing said slot to form a lubricant-chamber in front of the slide-block, for the purpose set forth.

In testimony that I claim the foregoing as turning movement of the driving shaft or r my invention I have signed my name, in presence of two witnesses, this 28th dayof J anuary, 1898.

ROBERT GRISSON. Witnesses:

ALEXANDER SPEoHT,

E. HH. MUMMENHOFF. 

